I have a ford 1985 F-150 that failed smog because it wouldn't hold pressure in the gas tank, something to do with the Charcoal Canister or some such according to the smog guy. He said there was too much carbon.
Welcome to California.
Are there any 1st places to look that anyone knows of for this problem ?
Basically what he does is pressurizes the tank and all the lines up to the charcoal cannister.
Anywhere from the hose from the filler neck to the tank could be cracks or loose clamps.
The top of the tank has a seal for the fuel pump and rollover valves. These are rubber and could be leaking.
Under the hood you will see the charcoal cannister inbetween the radiator and engine on the passenger side. The hose could be unplugged or cracks. Or the cannister may of failed. The cannister is unseviceable
except for the valve thats on it if it has one.
You could spend a couple hours trying to find the problem especially if it on top of the tank.
What the shop will do is pressurize the tank again and with the smog machine sniffer they can stick it where you can't access to see if it can smell fumes.
Takes a shop 10 minutes to find the area if you want to know.
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This is not a problem since f150 has duel fuel tanks, therefore its exempt from LPFET test
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Your charcoal canister is up in the front, normally to the left side or right side of the engine, near the front. It is black and has hoses going to it. You may need to replace this or see if your hoses have cracks.
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